Water → 5-chloro-1-(3-methylbenzyl)-1H-indole-2-carboxylic acid ethyl ester

関与物質

反応手順

Sodium hydride (60% dispersion in mineral oil, 0.44 g, 7.45 mmol) was added to a suspension of 5-chloro-1H-indole-2-carboxylic acid ethyl ester (2.00 g, 8.94 mmol) in N,N′-dimethylformamide (DMF) (20 ml) under nitrogen. The mixture was stirred for 1 h before addition of the 3-methylbenzyl bromide (2.07 g, 2.48 ml) and the reaction stirred for 17.5 h. Water was added to reaction mixture which precipitated product as a gummy solid. Supernatant liquid was decanted and the solid washed with water. The product was dissolved in dichloromethane (DCM), washed with water, dried over magnesium sulfate and concentrated. Purification by silica chromatography using DCM as eluent, yielded 5-chloro-1-(3-methylbenzyl)-1H-indole-2-carboxylic acid ethyl ester (3.03 g, 95%).

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